JWT Decoder & Validator

Developer Tool Featured

Decode, verify, and analyze JSON Web Tokens (JWTs) instantly. View token payload, header, and signature information. Perfect for API development and debugging.

JWT Token

0 characters

Verification Options

Leave empty for decode-only mode

Note: Verification happens in your browser. Secret keys are not sent to any server.

Token Structure

Enter a JWT token to see its structure

Claims Details

Token claims will appear here

JWT Basics

JSON Web Token (JWT) is an open standard for securely transmitting information between parties as a JSON object.

Token Format:
header.payload.signature
  • Header: Algorithm and token type
  • Payload: Claims and data
  • Signature: Verifies token integrity

Standard Claims

iss Issuer
sub Subject
aud Audience
exp Expiration Time
iat Issued At
nbf Not Before

Security Notes

  • Never expose secret keys in production
  • Use HTTPS for token transmission
  • Validate tokens on the server side
  • Keep tokens short-lived